The closest thing that I am aware of to a full war sim is ArmA 2. It has reasonably realistic ground combat over areas large enough for aircraft to maneuver meaningfully. However, the aircraft flight models are extremely simplistic.
Nonetheless I think the game proves that such a game is well within the grasp of home computers in the next couple of years, however it would be a monumental programming task with a restricted market (by the standards of the mass-market game industry) Because of this it would require a daring and dedicated development team, probably from a smaller company. Also even at ArmA 2's level of complexity the game and its expansions have been been plagued by bugs since its release, though it has steadily gotten better and better.
So for now I dream of such a game but I will not hold my breath. Heck I would be super impressed just to see something like large numbers of low-poly infantrymen put into a game like CoD, even if they weren't playable. imagine them scattering for the hedges as you strafe a column on a road! Arguably developers might be leery about putting that in because of the graphic nature.
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